Built myself a little veroboard pcb(1st MCU pcb), but i've got a ghost in the machine.
7805 1A with 100nf and electrolitic (16v/XXXXmf)
18.432Mhz crystal with 22pf capacitors(Fuses 1111 111)
Modified version of Peter Fleury's STK500v2Bootloader(added 324p and changed Crystal frequency)
Jtag, clkdiv8 disabled, 512 Blocksize etc as stated in Bootloader doc.
100nf over vcc and gnd, all power/gnd pins connected, 100nf over vref.
Isp connector, reset button.
External pullup on reset line.
Only the bootloader is installed, and if i pul a pin low(switch) it is activated, it pulls a pin low if active(led).
Now the problem, even if i connect one side of a small piece of wire(10cm) to the input pin the bootloader is activated and the led lights up :shock: , the voltage is 4,95v(and yes, measuring the voltage activates the pin also) so the internal pullup is active.
Tried with different pins and different ac/dc adapters(9v400mA/12v1A)
Sometimes when i reset the led will become active to(maby 1 out of 20 times)
If i leave the dragon connected to the isp port the protoboard seems intimidated and works ok(short test).
I'm at work at the moment but will test any suggestions when i come home later today
Thanks for the time!